package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;




    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了。则需要将数量加1
        if (list !=null && list.size()==1){
            shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果不存在，需要插入一条购物车数据
            //先判断添加到购物车的商品是一个菜品还是一个套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getByid(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(currentId);

    }

    /**
     * 减少购物车的数据
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long currentId = BaseContext.getCurrentId();//获取当前用户的id
        shoppingCart.setUserId(currentId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);//查询到当前用户相关商品


        if (list !=null && list.size()>0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            //如果商品number的数量大于1，直接将其number减1即可
            if (number==1){
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                shoppingCart.setNumber(number-1);
                shoppingCartMapper.updateNumberById(shoppingCart);

            }



        }


        //如果等于1，则直接删除该商品


    }


    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {

        Long currentId = BaseContext.getCurrentId();//获取当前微信用户的id
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(currentId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }



}
